"Wha-" He actually looks confused for a split second, brows knit as he faces Harry completely. Then it clicks and he just laughs. Holy shit that's... that's great. One that Harry clearly has no idea who Sam is and two that he assumes Nate and him were a thing of some sort.

"Christ no." And a few chuckles peter out cause it's actually pretty dang funny.

"You really don't know who Sam is?" Rub it in that Nate doesn't tell anyone anything super important apparently, or about him either. Guess he was part of the Sam package. The don't tell anyone this package.

"Sam was Nate's brother." In a tone that's more 'duh' than anything else.